Yz125 spark plug problem

The most likely thing is a faulty primary ignition coil,the one in the generator these suffer alot and when the get warm they pack up.try making the spark plug gap very small and see if it helps it. Also check to see if it has a spark just after it cuts out.

solved by poster

when i shut off my 2002 suzuki motorcyle it run perfect then went to start i and have no power battery good have no light on dash no head light brrake light everything is dead what could be wrong can you help with a idea thank you dave

Check your standard factory specs for spark plugs, it sounds like ur bike getting OVERHEAT!

Did you happen to check the over head valve camshaft? Ussually that bike , w/ age happen to be more tha 10 yrs old, cam shaft, valve guide are worn out and out of clearance! Check it please!

Hope that make your bike be reliable again!

I don;t know what engine is on your mower but if it has the self contained electronic ignition coil I have seen happen on several engines. It would run good for several min. then the spark just stops . And it will not spark again until it sets and cools . Just make sure it is the ignition that is not working.

check the compression with a compression tester. you may have burnt the ring out on the piston. if you don't have a compression tested you should buy one and test is right but if you remove the spark plug and stick your finger over the hole while you push the kick starter down it should force fully push your finger off. if so you have compression if not then you don't have compression and need to redue the top end.

if you have compression check for spark by taking the plug while it is still out and plug it back into the wire and rest the tip of the spark plug or side of it on the head and push the kick starter again. you should see the spark plug spark at the tip. if so it's good and if not you may have a bad coil or something in the ignition system.

but check that and et me know and i can further assist you.

Clean the carbeurator and possible the reed valves (if its a 2-stroke), had same problem with my yz125

A.dirty fuel line/filter/trash in carb B. bad coil C. carb too rich/carboned out spark plugs.D. short in the switch wires

Couple things- 1. If the plug was dirty after 1/2 hour you have either the wrong heat range plug(too cold) or 2. a fuel/carb issue. Buy a hotter NGK plug, ask for help the numbers don't always make sense. Use only full synthetic 2 stroke (I always liked bel-ray) and fresh 93 octane fuel. When you find a plug that works good buy a case of them, 2 stokes will foul plugs period. And some advice with your solution, never head into the woods without a spare plug, they will foul at the absolute worst time.

Don't forget to rate please!

Try taking a look at the catalatic converter if it is clogged it would make that happen no power and dies alot because it is clogging exhaust